This is a problem from Codeforces Round 975. I tried to solve it in the round time and expected to get higher rating. A solution of binary search to this problem jumped out in my mind, and I coded it quickly, but I got WA again and again. Please help me, maybe there are some mathematical wrong int my solution or some bugs in my codes, please pointed it out, thank you!!!!!
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You are doing binary search on a non monotone function
Could you explain that why it is a no monotone function?